On Fri, Jan 24, 2014 at 1:30 PM, Ljubomir Ljubojevic <centos@xxxxxxxx> wrote:
>>
>> and, even if you have the boot loader on both drives, there's no
>> guarantee your BIOS will boot from the 2nd one. Disks can partially
>> fail in nasty ways that might allow the already-running system to stay
>> up on the other half of the mirror, but when the drive is 'tested'
>> during power up boot sequence, it could hang the system.
>>
>
> True, but forwarding of root mail to admins e-mail address will warn
> about crash of mirror, so physical intervention of choice can be made. I
> think manual change in BIOS is of little consequence if system will boot
> off of surviving disk(s).
Doesn't grub need to know the bios disk id for subsequent stages of
the boot and where to find the root filesystem? I think it matters
whether or not bios remaps your 2nd drive to the first id.
> And if disks can be hot-swapped then only concern is that GRUB and /boot
> survive the crash.
And if you know how to do a rescue-mode boot and reinstall grub, you
can fix that too.
--
Les Mikesell
lesmikesell@xxxxxxxxx
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